Dental tool



G. G. BELL DENTAL TOOL Filed Nov 6, 1920 l/VI/EIVTOR 354,

ATTORNEYS Patented Apr. 17, l ria my lu a. A;

ionn'rai: TOOL.

Application filed Hovember 6. 1920.

To all whom it may concern.

Be it known that l, GEORGE limit. a citizen of the United States. and. a resident of Ashland, in the county of Boyd and State of Kentucky, have invented certain new and useful Improvements in Dental Tools, of which the following is a specification.

My invention relates generally to d ntal tools and more particularly to tool adapt ed for the removal of the excess plaster from a plaster Paris model and for the shaping up of the model so that it may properly fit within a flask.

It is a purpose of my in ention to pro vide a tool of the above described character which is simple and efiicient in construction and in which a plurality of teeth are provided that are adapted to move in various circular pairs when the tool is rotated and to thereby effect a scraping action upon the plaster Paris model when the latter is held against the same.

I will describe one form of tool embodying my invention and will then point out the novel features thereot in claims.

In the accompanying drawings:

Figure 1 is a view showing in front elevation one form of tool supporting wheel embodying my invention.

Figure 2 is a view showingin front elevation one form of tool embodying my invention.

Figure 3 is a view showing the supporting wheel and tool in assembled position, the former being shown in section.

Figure 4 is a fragmentary detail perspective View of a portion. of the tool shown in Fi ures 2 and 3.

imilar reference characters refer to similar parts in each of the several views.

Referring specifically to the drawings and particularly to Figures 2 and 3, T designates the tool proper which, as shown, comprises a body 15 of disc formation upon which is formed a multiplicity of triangular or wedge shaped teeth 16 having cutting edges 16. As shown in Figure 2, the teeth are arranged in rows with any two adjacent teeth disposed in reverse relation to each other as clearly shown in Figure 4-. The perimeter of the body 15 is formed with an annular flange 17 which is provided at intervals with slots 18.

Referring now to Figures 1 and 8, VV designates a supporting wheel including a erial No. 422355 y portion 20 arranged in advance of 1e hub port-ion and connected by spol 2.. The telly 20 is recessed on its forward side to provide an outwardly extending annular lip 22. The telly 20 is provided with openings at points corresponding to the slots 18 of the tool T in which are permanently seated retaining lugs 2-3 having heads 23. In the assembled position of the wheel W and the tool T as shown in Figure 3, the heads 23 ex tend into the slots 18 so as to securely hold the tool as a unit upon the wheel. In this position of the tool, the lip 22 contacts with the periphery of the tool and thus provides an additional support to hold the tool against edgewise displacement with respect to the wheel. It is to be particularly noted that the slots 18 are enlarged at one end to permit of the insertion of the heads 23 into the slots, and after the heads have been inserted the locking of the tool to the wheel can be readily effected by a rotation 01": the tool in an anti-clockwise direction as when viewed in Figure 2. This arrange ment also permits of the ready detaching of the tool from the wheel when it is desired to substitute a new tool or to sharpen a dull tool.

In practice, the entire tool is adapted to be placed on a dental lathe the shaft of the lathe extending through the hub 19 of the wheel and fixed thereto so that the tool as a unit will rotate with the shaft. With the tool in this position the several teeth 16 are exposed in the manner shown in Figure 8 so that when the lathe shaft is rotated at rotation of the several teeth is efiected. By holding the plaster Paris model against the tool T the cutting edges 16 of the revolving teeth will be caused to eii'ect a shaving of hub portion 19 and a tell the plaster Paris so that the operator by properly manipulating the model can remove all excess plaster and shape the model in the desired form so that it will fit within a flask.

Although I have herein shown and de' scribed only one form of tool embodying my invention, it is to be understood that various changes and modifications may be made herein without departing from the spirit of the invention and the spirit and scope or the appended claims.

What I claim is:

1. A tool of the character described comprisin a supporting wheel including a telly offset- With' respect to the hub of the Wheel, an annular lip formed on the periphery of said telly, lugs fixed Within the telly, a disc fitted Within said lip and having slots formed therein, said slots having enlarged ends to permit the insertion of said lugs into said slots and teeth formed on and extending laterally hem said disc.

2. A tool of the character described comprising a bed liming asubstantially flat face and teeth extending laterally of the face, seid teeth being arranged in pairs with the cutting edges of the teeth of each pair reversely disposed with respect 50 each other, and said pairs of teeth being a1- being arranged i1 pairs with the teeth 0'5 each pair revei'sely disposed with respect 50 each other and said pairs 01" teeth be ing arranged in parallel rows extending across the face 01? the disc and means for mounting the disc for i'etation about the approximate center thereof.

GEORGE Gil-AFT BELL. 

